"'The United States is getting accustomed to a completely crazy level of inequality,' Mr. Piketty said, with a degree of wonder. 'People say that reducing inequality is radical. I think that tolerating the level of inequality the United States tolerates is radical.'

As much as Mr. Piketty’s and Mr. Saez’s work has informed the national debate over earnings and fairness, their proposed corrective remains far outside the bounds of polite political conversation: much, much higher top marginal tax rates on the rich, up to 50 percent, or 70 percent or even 90 percent, from the current top rate of 35 percent."